Bouncer.py refers to BYUNKNOWN instead of UNKNOWN. Here's the fix: Index: Bouncer.py =================================================================== RCS file: /cvsroot/mailman/mailman/Mailman/Bouncer.py,v retrieving revision 2.30 diff -u -r2.30 Bouncer.py --- Bouncer.py 28 May 2002 03:02:23 -0000 2.30 +++ Bouncer.py 18 Jun 2002 16:14:38 -0000 @@ -216,7 +216,7 @@ {MemberAdaptor.BYBOUNCE: 'BYBOUNCE', MemberAdaptor.BYUSER: 'BYUSER', MemberAdaptor.BYADMIN: 'BYADMIN', - MemberAdaptor.BYUNKNOWN: 'BYUNKNOWN'}.get( + MemberAdaptor.UNKNOWN: 'UNKNOWN'}.get( reason, 'invalid value')) return # Send the next notification